Assessment of the efficiency of fertilisers, growth regulators and plant protection products application based on the results of biometric and photometric monitoring in barley crops

On grey forest medium loamy soil the efficiency of application of mineral and organo-mineral fertilizer Rostodar on the background of plant protection against weeds in barley crops of the variety "Moskovsky - 86" of the selection of the Federal Research Centre "Nemchinovka" was evaluated. It was noted that the joint application of fertilizers, full dose of herbicide and organomineral fertilizer Rostodar in the phase of sprouting and emergence into the tube in addition to the control (without fertilizers) allowed to obtain 14.2 c/ha, and in relation to the background N60P60K60 - 6.2 c/ha. The differences are mathematically reliable at NSR05 - 4.2 c/ha. The application of half dose of herbicide provided 32.7 c/ha, which is more than control and background by 10.4 and 2.3 c/ha. At the same time weed infestation of barley crops significantly decreased both on the background of application of full and half dose of herbicide Serto plus. The results of the ground-based determination of time series of reflectance index and NDVI of the experiment variants using photo-metric meter FI-20A are presented. The observed seasonal dynamics of the relationship between simple reflectance index and normalized differential vegetative index during barley ontogenesis is described by a logarithmic relationship with the value of approximation reliability R2 = 0.988. The greatest discrepancies between the values of barley vegetation indices were observed in the initial and final periods of vegetation. The data on the dynamics of vegetation indices allowed to reveal the result of stress phenomenon. The decrease in functional activity of plants under conditions of dry period was manifested in a sharp decrease in the amplitude of vegetation index. The minimum decrease was observed in the control plot. The period of recovery of agro-cenosis condition, which followed the period of stress, demonstrated high adaptive ability of barley, fixed in the growth of vegetation index. The results of photometric measurements made it possible to assess the dynamics of plot homogeneity, the amount of weed infestation and the effectiveness of the applied treatments and can be elements of a digital varietal passport of barley.